Three Can play that Game

What would you do if your best friend was killed?
16 years old Ava summers is still grieving from the death of her best friend Faith. No one knows who did it, or why they did it. Just her head was found in the snow, her body no where to be seen. Ava then meets caleb a guy who is the leader of his gang. One of the gang members mark will do anything to gain that leadership. Soon Ava and caleb start forming a strong bond between them. Ava is on a quest to find out who murdered her best friend with the help of caleb. But one thing Ava doesn't know is caleb is hiding a few secrets that could be the answers to her questions.